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/usr/share/gnome-shell/js/gdm/systemd.js is in gnome-shell-common 3.4.1-0ubuntu2.

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-

const GLib = imports.gi.GLib;
const Gio = imports.gi.Gio;

const SystemdLoginManagerIface = <interface name='org.freedesktop.login1.Manager'>
<method name='PowerOff'>
    <arg type='b' direction='in'/>
</method>
<method name='Reboot'>
    <arg type='b' direction='in'/>
</method>
<method name='CanPowerOff'>
    <arg type='s' direction='out'/>
</method>
<method name='CanReboot'>
    <arg type='s' direction='out'/>
</method>
</interface>;

const SystemdLoginManagerProxy = Gio.DBusProxy.makeProxyWrapper(SystemdLoginManagerIface);

function SystemdLoginManager() {
    return new SystemdLoginManagerProxy(Gio.DBus.system,
                                        'org.freedesktop.login1',
                                        '/org/freedesktop/login1');
};

function haveSystemd() {
    return GLib.access("/sys/fs/cgroup/systemd", 0) >= 0;
}